Calcination kiln



I Nov. 23, 1926.

NJ. URQUHART CALCINATION Kim:

Filed Feb. 9, 1924 Even Patented Nov. 23, 1926.

l m t- 'ro LIONEL ADAMS, 01 NEW oz-arenas, LOUISIANA.

OALCINATIGN KILN.

Application filed February 9, 1924. Serial No. 691,?84.

This invention relates to a calcination kiln and process and it is an object of the invention to provide novel and improved means whereby the material to be treated, after being finely comminuted, has each of the finely comminuted particles brought into direct contact with alive fiame, the zone of flame or heat being of desired length and the particles travelling through such zone to the collecting pot. i Y

Furthermore, it is an object of the invention to provide novel and improved means whereby the heat zone increases in temperature toward the retort, the associatel burners for creating the requisite flame being separately regulated so that any degree of temperature may be had at substantially any pointalong the zone or in other words the zone of regulation of ieat is entirely under control at all times.

Furthermore, the invention has for an obflume leading to the collecting pot.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved calcination kiln and process whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, 1 will now proceed to describe the same with reference to the accompanying drawings, wherein Figure 1 is a view in side elevation but of a diagrammatic character illustrating a kiln constructed in accordance with an embodiment of my invention;

Figure 2 is a view in top plan and also of a diagrammatic character of the fiume as embodied in Figure 1;

Figure 3 is a fragmentary sectional view taken horizontally through the central portion of Figure 2;

Figure 4 is an enlarged sectional view taken transversely of the fiume.

As disclosed in the accompanying drawings, 3 denotes a retort of a conventional type and discharging in the pot P thereof is the fiume F. The flume F is of desired length and disposed on an incline towardthepot so that the material to be treated may travel therethroughby gravity. Discharging within the upper or receiving end portion of the flume F is a hopper H which contains the material or ore to be treated. This material or ore before bein applied within the hopper is finely comminuted.

The upper or outer end of the fiume F has extending therein a burner 1 herein disclosed of a hydrocarbon or other type and which has associated therewith a steam or compressed air line 2 to assure requisite pres sure, said pressure for the calcination of lime-stone or the like being preferably about one-hundred and seventy-live pounds.

Tn communication with the flume at points spaced longitudinally thereof and at opposite sides thereof are thebranches B and extending in the outer end portion of each of said branches are the burners 8, each of which also having associated therewith a steam or compressed air line ll to create the requisite pressure. and 3 is under control of a valve 5 of any desired type whereby the requisite regulation can be had as will hereinafter be more particularly referred to;

The flume F and each of its branches B may be formed as desired but preferably comprises a steel jacket 6 the top of which being readily removable so that access may be conveniently had to the lining 7 thereof, said lining preferably consisting of fire clay bricks or other refractory materials. By this means, the flume maybe readily cleaned out or repaired as the occasions of practice may necessitate.

The flames of the burnersl and 3 project within the flame F proper and are disposed downwardly of the flame or in a direction toward the collecting pot F, said flames providing a range of heat extending the entire length of the flume or between the points 09 and 1 the temperature within the fiume increasing from the upper point 00 toward th lower point 3 In practice, in the calcination of limestone or the like the heat preferably ranges from 600 F. to 6,000 F., although it is to be understood that this may be readily regulated as the occasions of practice may necessitate and in accordance with the character of the material to be treated.

Each of the burners 1v In practice, the finely comminuted particles of raw material or ore, such as limestone or the like, is projected or dropped into the upper end of the fl ume from the hopper H and passes into the fire zone within the iiume F, each particle'coming in direct contact with the flame. In the present instance, the invention is particularly adapted for the production of lime and the flame is therefore of an oxidizing type. In the burning or calcination of the limestone or the like to produce hot lime or (CaO) the flame changes the calcium carbonate into a calcium oxide which travels by gravity through the living flame in the tl'ume. The

pressure generated by the flames from the bUIDBES 1 CtUlSi-IS the material current to flow in the direction ofthe collecting pot carrying along the finely comminuted material which isg-vbeingchan ed chemically as it PZLSSClOWII throughthefiume. In the calc'inatijon oi -limes'tone or the like this travelling is preferably at the rate of four feet per second;

If it is desirable to introduce a faster action, suitable pressure can be introduced into the finely comminuted material as it flows into the flume and increased pressure can also be introduced to the burners.

The material as delivered to the collecting pot and particularly in the calcination of limestone or the like constitutes a finished product and can then be readily carried't'o the customary cooling chamber or the like- Should it be desirable to have perfect control of the amount oi heat at any point change and modification without departing fromI the, principles and, sp rit thereof and for this, reason Ijdo. not. wish tobe Linden stood as limiting myseli'" to the-precise arrangeinent. malforma ion f. he ever parts herein shown in carrying Ontmy up venti n in. practice ex pt a s-h reinafter imed- 1 claim A kiln comprising, in, combination, a collecting pot, a fl'ume adapted to deliver'to the collectingpot, said fiume having branches in communication therewith at pointscspaced longitudinally thereof and at opposite sides of the flum'e, said branches extending diagonally with respect to the flurne in the direc-.

tion ofthe collecting pot, pressure feed fluid :tuel burners arranged within said branches anddirecting their, flames within the flume in a direction toward the collectingpot, and means for regulating the pressure for each burner.

In testimony whereof Ihereunto aflix my signature.

NORMAN J... UnoUr-mnr. 

